Abstract
Abstract The effect of the concentration and the nature of different n-alcohols (C2–C5) on the growth of C12E10 [CH3(CH2)11(OCH2CH2)10OH] micelles has been studied by tensiometric, viscometric, and proton NMR techniques. Critical micelle concentrations (CMC) were determined by surface-tension measurements in the presence of different concentrations of n-alcohols (C2–C4) and at different temperatures. The Gibbs free energy, enthalpy, and entropy of micellization ( , , ) and adsorption at an air/water interface ( , , ) were computed and discussed. An enthalpy–entropy compensation effect was observed at an isostructural temperature of about 300 K for both micellization and interfacial adsorption. The transfer enthalpies and heat capacities of the micelle from water to aqueous n-alcohol solutions were also computed. The intrinsic viscosity gave the hydrated micellar volume (Vh), volume of the hydrocarbon core (Vc), and the volume of the palisade layer of the OE unit (VOE). The spin–lattice proton relaxation time (T1) in the aqueous micellar region and 1H NMR were also used to study the behavior of OE micelles in both the absence and presence of alcohols. There was a slight rise in the cloud point (CP) when using lower alcohols. However a decrease was seen for n-BuOH and n-PenOH.
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